Car-ventilator.



PATENTED JAN 10, 1905.

J. E. ARMSTRONG.

GAR VBNTILATOR.

. APPLIOATIOH FILED DEC. 22. 1903.

W! TNESSEQ' [NI/ENTOR 27056. fir/Miro v BY gel. g z fiomey PatentedJanuary 10, 1905.

PATENT OFFICE.

JOHN E. ARMSTRONG, OF SANTA CRUZ, CALIFORNIA.

CAR-VENTILATOR.

SPECIFICATION forming part of Letters Patent No. 779,755, dated January10, 1905. Application filed December 22, 1903. Serial No. 186,162.

To (ZZZ whom it may concern:

Be it known that 1, JOHN E. ARMSTRONG, a citizen of the United States,residing at Santa Cruz, in the county of Santa Cruz and State ofCalifornia, have invented new and useful Improvements inCar-Ventilators, of which the following is a specification.

My invention relates to a means for ventilating cars and the like insuch a manner as to remove the vitiated air from the apartment and atthe same time prevent theintroduction of air in such a manner as tocreate disagreeable drafts.

My invention consists in so mounting the window or closure of thewindow-o pening that it may be moved either in its entirety orseetionally, so that a proportionately small opening is presented in thedirection toward which the train is running or from which the airdraftproceeds, and a larger opening is presented in the opposite direction,so that it will produce a species of suction and remove the air from thecompartment, while the suction thus set up through the large and smallopenings will not be such as to causea draft within the apartment.

Referring to the accompanying drawings, Figure 1 is a horizontal sectionshowing the preferred form of my apparatus. Fig. 2 is a side elevationof a car, showing my invention applied thereto.

It is not satisfactory to ventilate or freshen the air of ordinary carsor similar vehicles when traveling at a considerable rate of speed byopening the windows in the usual manner, as such opening usually causesdisagreeable drafts to the persons next behind the window.

It is the object of my invention to provide a means for changing the airwithin the car and at the same time avoiding any disagree. able drafts.

As shown in Fig. 1, the sections A A are pivoted in the space formedbetween the outer and inner walls of the cars, which is of sufficientdepth for this purpose. These windows 0r sashes are pivoted at top andbottom, so as to swing freely, and when closed the edges a contact withthe fixed uprights or stopposts 6 at each side' of the centrally-glazedportion 7 of the window. In this position the window-opening is closedand the movable sashes A may be locked by means of set-screws 8 intravelers 9. which are movable upon curved rods 10. The curvature ofthese rods is on the arc of a radius from the pivots or fulcrums 2,about which the sashes A are turn able.

If it be desired to produce a draft through the window, one of thesections or sashes A is moved by loosening the set-screw 8 and slidingthe traveler 9 along the rod 10 until a small vertical slit is producedbetween the edge a of the movable sash and the upright or stop-post 6 inthe direction toward which the car is moving. The opposite movable sashis in the same manner turned about its pivot,forming a wider verticalslit or opening between the edge a of the movable sash and the uprightor stop-post 6 upon that side and in the direction away from which thecar is moving. The centrally-glazed portion 7 of the window is setout,as shown, from the outside of the car, so that the hinged sashes Apresent more or less resistance to the air. Consequently a very smallopening in the front sash A will cause a considerable draft within thecar. Thus the draft caused by the rapid passage of the car through theair will cause a suction through the wider opening which will draw theair out faster than it can enter through the narrower opening at thefront. At the same time a circulation will be produced by this operationwhich will maintain the air within the car in a pure condition, butwithout disagreeable or unnecessary draft.

In order to prevent an escape of air at the inner edges (0 of theswinging sash A, I have shown a curved wall or segment [L3, fixedbetween the outer and inner walls of the car in such amanner that theedge a of the sash will follow the curvature of this are and form asubstantially close joint therewith during the movement of the sashes A,and thus prevent any escape of air in that direction.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. An improved car-window construction comprising a glazed portion setout from the side of the car, independent sashes occupying the spacesbetween the edges of the glazed portion and the side of the car, saidsashes being pivotally mounted'mid way of their side edges, and curvedguides for opposite edges of the sashes.

2. An improved car-Window construction comprising a glazed portion setout from the side of the car, independent sashes occupying the spacesbetween the edges of the glazed portion and the side of the car and eachcentrally pivoted at a point located at one side of their verticalplane, and curved guides for opposite edges of the sashes said guidesbeing concentric with the axis of the sashes, and means engaging one ofsaid guides, for locking the sash in its open and closed position.

In testimony whereof I have hereunto set my hand in presence of tWosubscribing Witnesses.

JOHN E. ARMSTRONG. Witnesses:

WV. N. GARDNER, ED. MARTIN.

